Electric heating device.



B. L. HAILEY.

ELECTRIC HEATING DEVICE.

APPLIOATIOLI FILED MAR. 9, 1909.

Patented ma 24, 1910.

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2 iii 8 M 9 1 19 I 15 x 1s 2 i8 vwrisyh gkz." 'INVENTOH QM) RObQJ L H d/ 3 n v5 By ATTORNE LS R. L. HAILEY. ELECTRIC HEATING DEVICE.

APPLICATION FILED MAR-9,1909.

959,Q1 5. Patentefi my 24, 1910.

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ROBERT L. HAILEY, OF NEW YORK, N. Y., ASSIGNOR TO THE LOWE ELECTRIC COMPANY, OIE NEW YORK, N. Y., A CORPORATION OF NEW YORK.

ELECTRIC HEATING DEVICE.

1'0 all whom it may concern:

Be it known that I, ROBERT L. HAILEY, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electric Heating Devices, of which the following is a specification.

My invention relates to electric heating devices wherein a heat radiating plate is caused to be heated by a current of elec tricity passing through a high resistance element secured to the radiating plate.

My invention is most particularly applicable to electrically heated smoothing irons and will be described as applied to this type of device although it is not limited to the same as it might be applied to other forms of devices without departing from the spirit of my invention.

The main object of my invention is to construct an electric heating device which will be very simple in construction and of very few parts and one in which the full heating effect of the current will be transmitted to the radiating element.

A further object of my invention is to provide a device with a resistance element that can readily be removed from the device should it become broken or injured in any wav.

T 0 these ends my invention consists in the novel resistance unit, both as to its arrangement and form.

It also consists in the novel way of making connection between the resistance element proper and the terminal posts whereby the terminal posts may be detached from the resistance element without employing tools of any kind.

My invention also consists in the details of construction and combinations of parts hereinafter more particularly described and then specified in the claims.

In the accompanying drawings, Figure 1 illustrates a vertical central section through a smoothing iron constructed in accordance with my invention. Fig. 2 is a transverse vertical section taken on the line X X Fig. 1. Fig. 3 is a plan view of the device, the cover being removed. Fig. 4 is a plan view of the resistance unit, parts being broken away to more clearly show the resistance element. Fig. 5 is an enlarged de- Specification of Letters Patent.

Application filed March 9, 1909.

Patented May 24:, 1910.

Serial No. 482,256.

tached view of a section of the resistance element. Fig. 6 is a transverse section taken on the line Y Y Fig. 5, the same being shown on an enlarged scale.

In the drawings, 1 indicates the heat radiating plate which is preferably very heavy so that the heat will be practically uniform and will not appreciably vary due to slight variations of the electric current in the resistance element. 2 indicates the resistance element which is preferably formed by arranging a wire in zig-zag fashion and then flattening it between rollers or by a press. By so flattening the wire, sharp edges are formed which readily give ofi the heat generated in the wire by the passage of an electric current therethrough and present a larger surface in proximity to the radiating plate than when the ordinary round wire is used. The wire 2 is bent back and forth and preferably formed into a shape to coincide with the contour of the radiating plate, all the turns or parts of the wire lying in the same horizontal plane.

3 indicates a sheet of insulation, preferably mica, interposed betwen the wire 2 and the radiating plate 1. Superimposed on top of the wire 2 is a similar sheet of insulation 4 and upon which a clamping plate 5 bears.

6 indicates clamping screws which pass through the clamping plate 5 and enter the radiating plate 1, the resistance element 2 being firmly clamped to the radiating plate by tightening the said screws and forcing the plate 5 down. In the middle of the clamping plate I provide a pair of screws 7 having a clamping head 7 which also serve to effectually clamp the middle of the plate 5 to the radiating plate thereby insuring that all parts of the resistance wire 2 will be pressed tightly against the radiating plate. The clamping screws 7 are provided with a vertical post 8 rising from the nut 7'.

9 indicates a cover formed as a hollow inverted dish and which incloses the resistance unit, the edges of the cover 9 bearing on the upper surface of the radiating plate 1 and flush with the sides thereof. The upper ends of the posts 8 pass through suitable openings in said cover. By this construction the iron is made to present a very neat appearance as no part of the resistance element shows from the outside.

10 indicates the handle mounted on a support 11, me said support oelng secured to me cover 9 by screws 12 tapped into the ends of the posts 8 whereby, instead of having the handle secured to the cover as is usual, it is secured to the radiating plate and therefore the entire weight is lifted direct by the handle.

13 indicates a bar to which is secured the terminal post consisting of vertical spindles 1 1, 15 suitably insulated from the bar 13. The lower ends of the spindles 1a, 15 are provided with heads 16 which pass through suitable openings 17 in the upper sheet of insulation 4.

18 indicates metallic contact plates which are preferably loosely placed on each end of the wire 2 forming the resistance element, and are engaged by the heads 16 of the terminal posts 14:, 15 when the bar 13 is placed on top of the insulation 4. A clamping screw 19 threaded into the radiating plate 1 clamps the bar 13 to said plate and presses the heads 16 on the contact-plates 18 which in turn are pressed firmly on the resistance wire 2.

20 indicates detachable plugs to which the circuit wires 21, 22 are secured in the usual way and which engage the spindles 14, 15 when it is desired to use the device, the plugs passing through suitable openings formed in the cover 9.

It will be noted that, should the resistance wire become destroyed, it can readily be re placed by detaching the clamping plate 5 and bar 13, the terminal posts having no fast connection therewith, but nevertheless form an effective electrical connection as heretofore described.

lVhat I claim as my invention is:

1. In an electrically heated iron, the combination of a radiating plate, a zigzag resistance element all the turns of which are located in the same horizontal plane and insulated from said radiating plate and a clamping plate insulated from said resistance element and adapted to press all the parts of said resistance element uniformly toward said radiating plate.

2. In an electrically heated iron, the combination of a radiating plate, a zigzag resistance element all the turns of which are located in the same horizontal plane and insulated from said radiating plate, a clamping plate insulated from said resistance element and means adapted to clamp said plate to said radiating plate both at the sides and through the middle.

3. In an electrically heated smoothing iron, the combination of a radiating plate, a resistance element insulated from said radiating plate, a clamping plate insulated from said resistance element, clamping screws adapted to clamp said resistance element to said radiating plate, a cover plate and a. handle secured ro s-Loni rauiaung nue by said clamping screws.

4t. In an electrically heated smoothing iron, the combination of a radiating plate, a resistance element insulated from said plate, a clamping plate insulated from said resist ance element, clamping screws near the edge of said clamping plate, clamping screws in the middle of said plate and provided with vertical posts, a cover plate and a handle secured to said vertical posts.

A resistance element consisting of a flattened zig-zag wire, all the parts of which are located in the same horizontal plane.

6. A resistance unit consisting of a Hattened zig-zag wire, all the parts of which are located in the same horizontal plane, sheets of insulation above and below said wire, the upper insulating sheet being provided with openings through which terminal posts are adapted to pass and press against said resistance wire.

7. In an electrically heated smoothing iron, the combination of a radiating plate. a clamping plate, a resistance element between said radiating plate and said clamping plate and insulated from both said plates, metallic contact-plates on the ends of said resistance element and terminal posts adapted to press against said contact-plates.

S. In an electrically heated smoothing iron, the combination with a heat radiating plate, a resistance element consisting of a. flattened zig-zag wire all the turns of which are in the same horizontal plane and insulated "from said radiating plate, a clan'nping plate above said resistance element, insulation between said resistance element and said clamping )late, contact-plates loosely seated on the ends of said resistance wire and terminal posts adapted to pass through openings in the upper insulation and press against said contact-plates.

S). In an electrically heated smoothing iron, the combination of a heat radiating plate, a resistance element consisting of a zig-zag wire all the turns of which lie in the same horizontal plane and insulated from said radiating plate, a clamping plate insulated from said resistance wire, contact plates on the ends of said resistance wire, a bar carrying terminal posts and means adapted to clamp said bar to said radiating plate whereby the ends of said terminal posts will be pressed against said contact-plates.

Signed at New York in the county of New York and State of New York this 8th day of March A. D. 1909.

ROBERT L. HAILEY.

lVitnesses IRENE LEFKOWITZ, EDWARD M. JELLINEK. 

